the thing is, IGA expressed the thought that he only is making Bloodstained the genre it is because the fans requested it, but he seems like he wants to move on to create other types of games.
yea there can be others that can carry the Bloodstained torch, but I dunno, while Bloodstained ROTN can be epic and even surpass all the Castlevanias to some people, its not the perfect genre to everyone.
but if they make Bloodstained a ongoing IGAvania series, that could be cool and would get the next one if its to my liking.
the genre really still is uncommon, so like battle royale games, more games can result in new masterpieces that improve the genre.